What’s Vulnerable › Vulnerabilities

CVE-2026-107222: Excelize: GetConditionalFormats indexes conditional-formatting rule sub-elements with no length or nil check

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-07 · updated 2026-10-13
• Weakness: CWE-129

Description

Excelize is a Go language library for reading and writing Microsoft Excel spreadsheets. From 2.7.0 to 2.11.0, conditional-format extraction indexes required child slices or dereferences an optional colorScale child without validating malformed rule structure. GetConditionalFormats reaches extractCondFmtCellIs and also indexes ColorScale.Cfvo, DataBar.Cfvo, and DataBar.Color without complete structural checks. When a crafted worksheet supplies a cellIs, dataBar, or colorScale rule missing expected children and the application calls GetConditionalFormats, missing formula, color, value-object, or colorScale data reaches an out-of-range index or nil dereference, allowing an attacker to panic and terminate an unprotected process. No fixed version is available as of this review.

Affected products

• qax-os excelize: from 2.7.0 through 2.11.0

References

• https://github.com/qax-os/excelize/commit/be7a16390fa69c71d3ca618c741d1a2b5ed362cd
• https://github.com/qax-os/excelize/pull/2375
• https://github.com/qax-os/excelize/security/advisories/GHSA-rxcj-4pj5-74gr
• https://github.com/qax-os/excelize/security/advisories/GHSA-rxcj-4pj5-74gr

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